20133221232 has 80 divisors (see below), whose sum is σ = 53871552000. Its totient is φ = 6471558912.

The previous prime is 20133221231. The next prime is 20133221233. The reversal of 20133221232 is 23212233102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20133221231) and next prime (20133221233).

It is a junction number, because it is equal to n+sod(n) for n = 20133221199 and 20133221208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133221231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159269 + ... + 1176507.

It is an arithmetic number, because the mean of its divisors is an integer number (673394400).

Almost surely, 2^20133221232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20133221232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26935776000).

20133221232 is an abundant number, since it is smaller than the sum of its proper divisors (33738330768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20133221232 is a wasteful number, since it uses less digits than its factorization.

20133221232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18118 (or 18112 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20133221232 its reverse (23212233102), we get a palindrome (43345454334).

The spelling of 20133221232 in words is "twenty billion, one hundred thirty-three million, two hundred twenty-one thousand, two hundred thirty-two".